无机盐工业

无机盐工业 ›› 2021, Vol. 54 ›› Issue (4): 76-80.doi: 10.11962/1006-4990.2020-0319

• 环境·健康·安全 • 上一篇    下一篇

丁二酸对水热合成α-半水脱硫石膏微晶形貌及力学强度的影响

胡成1,2,3,向玮衡1,2,3(),陈平1,2,3,明阳1,2,3   

  1. 1.桂林理工大学,广西建筑新能源与节能重点实验室,广西桂林 541004
    2.桂林理工大学,土木与建筑工程学院
    3.桂林理工大学,广西工业废渣建材资源利用工程技术研究中心
  • 收稿日期:2020-10-16 出版日期:2021-04-01 发布日期:2021-04-23
  • 通讯作者: 向玮衡
  • 作者简介:胡成(1988— ),男,博士,讲师,主要从事固废资源利用、绿色建材技术研究;E-mail: hucheng0402@wust.edu.cn
  • 基金资助:
    国家自然科学基金(52062009);广西建筑新能源与节能重点实验室开发基金(桂科能)(19-J-22-3)

Effects of succinic acid on crystallite morphology and mechanical strength of α-hemihydrate desulfurized gypsum synthesized by hydrothermal method

Cheng Hu1,2,3,Weiheng Xiang1,2,3(),Ping Chen1,2,3,Yang Ming1,2,3   

  1. 1. Guangxi Key Laboratory of New Energy and Building Energy Saving,Guilin University of Technology,Guilin 541004,China
    2. College of Civil and Architecture Engineering,Guilin University of Technology
    3. Guangxi Engineering and Technology Center for Utilization of Industrial Waste Residue in Building Materials,Guilin University of Technology
  • Received:2020-10-16 Online:2021-04-01 Published:2021-04-23
  • Contact: Weiheng Xiang

摘要:

为提高脱硫石膏利用率和附加值,采用水热合成法在温度为95 ℃的15%(质量分数)氯化钠溶液中制备高强α-半水脱硫石膏材料,研究了丁二酸掺量对α-半水脱硫石膏转晶行为、物相组成、微晶形貌及力学强度的影响。结果表明,随着丁二酸掺量的增加,α-半水脱硫石膏的诱导成核与晶体生长时间均逐渐增大,转晶时间延长。同时,α-半水脱硫石膏的长径比随着丁二酸掺量的增加而降低,这有利于促进α-半水脱硫石膏水化,提高结构密实性,改善材料的力学性能。其中,掺入0.20%(质量分数)丁二酸时α-半水脱硫石膏的长径比降至1∶1左右,其2 h抗折强度和烘干抗压强度分别提高至5.54 MPa、38.47 MPa。

关键词: 水热合成法, 丁二酸, α-半水脱硫石膏, 长径比, 力学强度

Abstract:

In order to improve untilization rate and additional value of desulfurized gypsum,high strength α-hemihydrate desulfurization gypsum material was prepared by hydrothermal synthesis method in 15%(mass fraction) NaCl solution at 95 ℃. The effects of succinic acid content on crystal transformation behavior,phase composition,crystallite morphology and mechanical strength of the α-hemihydrate desulfurized gypsum were studied.The results showed that the induction nucleation and crystal growth times of the α-hemihydrate desulfurized gypsum increased gradually with the increase of mixing amount of succinic acid and the crystal transformation time was prolonged.At the same time,the length-diameter ratio of the α-hemihydrate desulfurized gypsum decreased with increase of succinic acid,which was benefit to promote hydration of α-hemihydrate desulfurized gypsum and improve compactness to enhance mechanical properties of the materials.Among,the length-diameter ratio of α-hemihydrate desulfurized gypsum reduced to 1∶1 with succinic acid of 0.20%(mass fraction) which enhanced the 2 h flexural strength and drying compressive strength of the materials to 5.54 MPa and 38.47 MPa,respectively.

Key words: hydrothermal synthesis method, succinic acid, α-hemihydrate desulfurized gypsum, length-diameter ratio, mechanical strength

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